window.onload = function () {
  var map = new BMap.Map("map");
  var point = new BMap.Point(116.736, 38.059);
  map.centerAndZoom(point, 16);
  map.addControl(new BMap.NavigationControl({ anchor: BMAP_ANCHOR_TOP_RIGHT }));
  map.enableScrollWheelZoom(true); //开启鼠标滚轮缩放
  var marker = new BMap.Marker(point); // 创建标注
  map.addOverlay(marker); // 将标注添加到地图中
  marker.disableDragging(); // 不可拖拽
};
